| 摘要 |
PURPOSE:To prevent the remaining of strain or the lowering of airtight property in window glass by annularly disposing the window glass along the outer circumference of the through-hole of an indentation between the window glass and a cap proper section. CONSTITUTION:The inside of an annular groove 16 is previously coated with a welding material 14 in quantity slightly higher than the upper surface of the annular groove 16. Low-melting point glass having the melting point of a temperature such as approximately 300 deg.C is used as the welding material 14. The light-transmitting window glass 4 is placed while its fringe is placed onto the welding material 14, a weight 15 is placed onto the window glass, the welding material 14 is melted through temporary heating, and the window glass 4 is fixed to the egde of the through-hole. The lower surface of the fringe of the window glass 4 is fast stuck to the whole region of the annular ceiling surface of the cap proper 13 by the weight of the weight 15 at that time, and the outer circumferential section is fast stuck to the welding material 14 encased into the annular groove 16, and fixed to the cap proper 13 by the welding material 14. The welding material 14 is cured through cooling while removing the weight 15, and the cap 3 is manufactured. |
